Metabase with java/spring

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I can't make my app working. I have created these simple endpoints :

@GetMapping("/sso/metabase")
  public void ssoToMetabase(HttpServletResponse response, @RequestParam(required = false) String return_to)
      throws IOException {
    System.out.println("SSO to Metabase called with return_to: " + return_to);
    String email = "Test@gmail.com";
    String firstName = "Test";
    String lastName = "Test";
    User user = new User();
    user.setEmail(email);
    user.setFirstName(firstName);
    user.setLastName(lastName);
    String token = jwtService.signToken(user);
    String ssoUrl = metabaseUrl + "/auth/sso?jwt=" + token;
    if (return_to != null && !return_to.isEmpty()) {
      ssoUrl += "&return_to=" + URLEncoder.encode(return_to, StandardCharsets.UTF_8.toString());
    }
    response.sendRedirect(ssoUrl);
  }


  @GetMapping("/analytics")
  public void showAnalytics(HttpServletResponse response) throws IOException {

    String iframeUrl = "/sso/metabase?return_to=" + METABASE_DASHBOARD_PATH;

    String html = "<iframe src=\"" + iframeUrl
        + "\" frameborder=\"0\" width=\"1280\" height=\"600\" allowtransparency=\"true\"></iframe>";
    response.setContentType("text/html");
    response.getWriter().write(html);
  }

but when I hit /analytics endpoint it just redirects over and over.. Metabase with java/spring